MySQL Sniffer

MySQL Sniffer 是360开源的一个基于 MySQL 协议的抓包工具, 能实时抓取客户端端请求，并格式化输出操作语句，操作十分简单。
对于问题的定位，操作的审核是个不错的利器。

Github地址：https://github.com/Qihoo360/mysql-sniffer

安装

# yum install glib2-devel libpcap-devel libnet-devel
# unzip mysql-sniffer-master.zip
# cd mysql-sniffer-master
# cmake .

-- Configuring done
-- Generating done
-- Build files have been written to: /root/mysql-sniffer-master

# make

Scanning dependencies of target mysql-sniffer
[ 16%] Building C object bin/CMakeFiles/mysql-sniffer.dir/main.c.o
[ 33%] Building C object bin/CMakeFiles/mysql-sniffer.dir/mysql-dissector.c.o
/root/mysql-sniffer-master/src/mysql-dissector.c: In function ‘decode_mysql_lenenc_int’:
/root/mysql-sniffer-master/src/mysql-dissector.c:112: warning: dereferencing type-punned pointer will break strict-aliasing rules
[ 50%] Building C object bin/CMakeFiles/mysql-sniffer.dir/util.c.o
[ 66%] Building CXX object bin/CMakeFiles/mysql-sniffer.dir/session.cpp.o
[ 83%] Building CXX object bin/CMakeFiles/mysql-sniffer.dir/sniff-config.cpp.o
[100%] Building CXX object bin/CMakeFiles/mysql-sniffer.dir/sniff-log.cpp.o
Linking CXX executable mysql-sniffer
[100%] Built target mysql-sniffer

# cd bin/

# ls

CMakeFiles  cmake_install.cmake  Makefile  mysql-sniffer

参数说明

参数说明也是简明易懂。

# ./mysql-sniffer -help
Usage ./mysql-sniffer [-d] -i eth0 -p 3306,3307,3308 -l /var/log/mysql-sniffer/ -e stderr
         [-d] -i eth0 -r 3000-4000
         -d daemon mode.
         -s how often to split the log file(minute, eg. 1440). if less than 0, split log everyday
         -i interface. Default to eth0
         -p port, default to 3306. Multiple ports should be splited by ','. eg. 3306,3307
            this option has no effect when -f is set.
         -r port range, Don't use -r and -p at the same time
         -l query log DIRECTORY. Make sure that the directory is accessible. Default to stdout.
         -e error log FILENAME or 'stderr'. if set to /dev/null, runtime error will not be recorded
         -f filename. use pcap file instead capturing the network interface
         -w white list. dont capture the port. Multiple ports should be splited by ','.
         -t truncation length. truncate long query if it's longer than specified length. Less than 0 means no truncation
         -n keeping tcp stream count, if not set, default is 65536. if active tcp count is larger than the specified count, mysql-sniffer will remove the oldest one

示例

# ./mysql-sniffer -i eth0 -p 3306

其中，倒数第二列是返回数据的行数。

2017-03-08 11:00:08     root     192.168.244.20     NULL              0ms              1     select @@version_comment limit 1
2017-03-08 11:00:08     root     192.168.244.20     NULL              0ms              1     select USER()
2017-03-08 11:00:10     root     192.168.244.20     NULL              0ms              1     select 1
2017-03-08 11:01:46     root     192.168.244.20     NULL              0ms              1     SELECT DATABASE()
2017-03-08 11:01:46     root     192.168.244.20     test             24ms              0     use test
2017-03-08 11:01:46     root     192.168.244.20     test            172ms             14     show databases
2017-03-08 11:01:46     root     192.168.244.20     test              0ms             20     show tables
2017-03-08 11:01:52     root     192.168.244.20     test              0ms             20     show tables
2017-03-08 11:01:57     root     192.168.244.20     test             58ms              9     select * from test1
2017-03-08 11:02:17     root     192.168.244.20     test              0ms              1     SELECT DATABASE()
2017-03-08 11:02:17     root     192.168.244.20     test              0ms              0     use test

注意

1. 只能抓取新建的链接，如果是之前创建的链接将获取不到用户名和库名，并有一定几率丢包。

2. 如果客户端是在本地，如果走的是tcp连接的话，如mysql -h 192.168.244.10 -uroot -p123456，其中192.168.244.10是本地主机ip，
则只能通过回环地址来捕捉，./mysql-sniffer -i lo -p 3306

参考

https://github.com/Qihoo360/mysql-sniffer/blob/master/README_CN.md